1. Forestry Development Department, Teagasc, Dublin, Ireland
2. Max Planck Institute for Chemical Ecology, Jena, Germany
3. Department of Zoology and Entomology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
4. Research Institute for Nature and Forest (INBO), Geraardsbergen, Belgium
5. Department of Crop Protection, Faculty of Agricultural and Applied Biological Sciences, Ghent University, Ghent, Belgium